Weston (the meter company) made precision shunts for the last 100 years. Used ones are widely available on the surplus market. It may sometimes be a bit hard to read the range. The bigger-thicker the shunt the higher the current range. Virtually all of these shunts are 50mV types. (I have seen some oddball Soviet Block shunts - but they are rare) However, a quick check with an ammeter & Voltmeter will confirm the range.
Many of these can be obtained off ebay, Ham-Fests, swap meets or electronic surplus stores for just a couple of dollars. If you look hard you may find some of the rare 25mV shunts made by Western Electric for the Bell System. These were hand trimmed to a level of precision not found in today's mass production economy. Good hunting. Regards, Michael Taylor PE, NCE Still frozen in Colorado -----Original Message----- From: Finlayson Joseph-G3162C [ mailto:[email protected]] Sent: Wednesday, February 18, 2004 8:08 AM To: '[email protected]'; 'EMC PSTC' Cc: Finlayson Joseph-G3162C; 'Price, Ed'; 'Gary McInturff' Subject: RE: DC Current Probes This looks like a solution I can work with. I would like to thank the many contributors of this list for their valuable input on this subject. Regards, Joe -----Original Message----- From: Peter L. Tarver [ mailto:[email protected]] Sent: Tuesday, February 17, 2004 5:40 PM To: 'EMC PSTC' Cc: Finlayson Joseph-G3162C; 'Price, Ed'; 'Gary McInturff' Subject: RE: DC Current Probes Joe - I use several current shunts. 50 mV : 50 A is the most commonly used in my lab. I also have: 50 mV : 5 A 50 mV : 10 A 50 mV : 100 A 50 mV : 150 A You can calculate the impedance of these shunts from the ratios mentioned above. They are available from Grainger and cost under $45.00 for the smaller sizes and $65.00 for a 50 mV : 500 A unit. Go to Grainger's web site and do a keyword search on shunt. http://www.grainger.com/ Aside from their use as stand alone pieces, I also build them into mode complicated test jigs. Regards, Peter L. Tarver, PE [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
